| // Copyright Istio Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package uds |
| |
| import ( |
| "fmt" |
| "net" |
| "os" |
| "path/filepath" |
| ) |
| |
| import ( |
| "istio.io/pkg/log" |
| ) |
| |
| func NewListener(path string) (net.Listener, error) { |
| // Remove unix socket before use. |
| if err := os.Remove(path); err != nil && !os.IsNotExist(err) { |
| // Anything other than "file not found" is an error. |
| return nil, fmt.Errorf("failed to remove unix://%s: %v", path, err) |
| } |
| |
| // Attempt to create the folder in case it doesn't exist |
| if err := os.MkdirAll(filepath.Dir(path), 0o750); err != nil { |
| // If we cannot create it, just warn here - we will fail later if there is a real error |
| log.Warnf("Failed to create directory for %v: %v", path, err) |
| } |
| |
| var err error |
| listener, err := net.Listen("unix", path) |
| if err != nil { |
| return nil, fmt.Errorf("failed to listen on unix socket %q: %v", path, err) |
| } |
| |
| // Update file permission so that istio-proxy has permission to access it. |
| if _, err := os.Stat(path); err != nil { |
| return nil, fmt.Errorf("uds file %q doesn't exist", path) |
| } |
| if err := os.Chmod(path, 0o666); err != nil { |
| return nil, fmt.Errorf("failed to update %q permission", path) |
| } |
| |
| return listener, nil |
| } |